I came accross some website that offer a service to know the number of BTC from a public address , that's great , but I would like to know if there are other ways to easily knowing how much value a particular public address is holding.

If I'm asking this is because I'm planning to buy physical Bitcoins, but still struggle to see how to verify how many BTC it is funded.

I can't understand what are you looking for. Have you used blockchain.info for that? Is there any difficulties? To my mind no and it's easiest esy to check balance of bitcoin adresses. Information will be 100% correct and if you want, use another website, for example blocktrail and you'll see much more than on blockchain.P.S This isn't service, it's function of blockchain and block explorer websites to show you that.

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